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<p>The black twig borer, <i>Xylosandrus compactus</i> (Eichhoff), is a globally invasive ambrosia beetle. In recent years, <i>X. compactus</i> has attacked healthy plant branches and caused economic damage to ornamental trees in many locations worldwide, including in Shanghai city. In this study, two fungal species were consistently isolated from the beetle mycangia and its galleries. One is <i>Ambrosiella xylebori</i>, a known symbiont, the other one is <i>Thyridium lauri</i>, a recently described species whose association with the beetle has not been reported from Asia, it’s native region. The two fungal species were recorded as symbiotic fungi associated with <i>X. compactus</i> in several collections. In order to clarify the role of symbiotic fungi during the <i>X. compactus</i> attack on the tree branches, the pathogenicity of both fungi was tested on eight ornamental trees, including <i>Magnolia grandiflora</i>,<i> M. denudata</i>,<i> Platanus acerifolia</i>,<i> Acer palmatum</i>,<i> Cinnamomum camphora</i>,<i> Cerasus yedoensis</i>,<i> Liquidambar formosana</i>, and <i>Quercus texana</i>. Our results showed that the two fungal species had low damage potential, at least on young ornamental trees. Therefore, the killing of the twigs is attributable to the disruption of vascular tissues by beetle drilling, rather than to the pathogenicity of fungal associates. This suggests that<i> Thyridium lauri</i> does not act as a pathogen on its native host trees, as it does on susceptible laurels in invaded regions.</p>

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Identification of a novel fungus associated with Xylosandrus compactus (Eichhoff) and its pathogenicity to ornamental plants

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • Ronghua Sun,
  • You Li,
  • Qingquan Luo,
  • Runlei Chang,
  • Feng Wang,
  • Guangliang Lu,
  • Xueting Sun,
  • Wei Lin,
  • Zhangxun Wang,
  • Hulcr Jiri,
  • Lei Gao

摘要

The black twig borer, Xylosandrus compactus (Eichhoff), is a globally invasive ambrosia beetle. In recent years, X. compactus has attacked healthy plant branches and caused economic damage to ornamental trees in many locations worldwide, including in Shanghai city. In this study, two fungal species were consistently isolated from the beetle mycangia and its galleries. One is Ambrosiella xylebori, a known symbiont, the other one is Thyridium lauri, a recently described species whose association with the beetle has not been reported from Asia, it’s native region. The two fungal species were recorded as symbiotic fungi associated with X. compactus in several collections. In order to clarify the role of symbiotic fungi during the X. compactus attack on the tree branches, the pathogenicity of both fungi was tested on eight ornamental trees, including Magnolia grandiflora, M. denudata, Platanus acerifolia, Acer palmatum, Cinnamomum camphora, Cerasus yedoensis, Liquidambar formosana, and Quercus texana. Our results showed that the two fungal species had low damage potential, at least on young ornamental trees. Therefore, the killing of the twigs is attributable to the disruption of vascular tissues by beetle drilling, rather than to the pathogenicity of fungal associates. This suggests that Thyridium lauri does not act as a pathogen on its native host trees, as it does on susceptible laurels in invaded regions.